Notch filter utilized for near field communication and wireless power transfer dual mode antennas

Abstract

One aspect of the disclosure provides an apparatus for wirelessly coupling with other devices including an antenna, wireless power circuitry configured to receive wireless power from the antenna at a first frequency, communication circuitry coupled to the antenna and configured to receive a signal from the antenna at a second frequency different from the first frequency, and a filter circuit coupled between the antenna and an input of the wireless power circuitry, the filter circuit configured to electrically connect the wireless power circuitry to the antenna at the first frequency and electrically isolate the wireless power circuitry from the communication circuitry at the second frequency.

What is claimed is: 
     
         1 . An apparatus for wirelessly coupling with other devices, comprising:
 an antenna;   wireless power circuitry configured to receive wireless power from the antenna at a first frequency;   communication circuitry coupled to the antenna and configured to receive a signal from the antenna at a second frequency different from the first frequency; and   a filter circuit coupled between the antenna and an input of the wireless power circuitry, the filter circuit configured to electrically connect the wireless power circuitry to the antenna at the first frequency and electrically isolate the wireless power circuitry from the communication circuitry at the second frequency.   
     
     
         2 . The apparatus of  claim 1 , wherein the filter circuit provides a substantially closed circuit at the first frequency and a substantially open circuit at the second frequency. 
     
     
         3 . The apparatus of  claim 1 , further comprising:
 a first matching circuit connected to an output of the antenna and configured to match a first impedance of the wireless power circuitry to a second impedance of the antenna at the first frequency;   wherein the filter circuit is configured to electrically isolate the wireless power circuitry from the first matching circuit, the antenna, and the communication circuitry at the second frequency.   
     
     
         4 . The apparatus of  claim 3 , wherein the output of the antenna comprises a first terminal and a second terminal and wherein the first matching circuit comprises a first capacitor connected in series with the first terminal and a second capacitor connected in series with the second terminal. 
     
     
         5 . The apparatus of  claim 1 , wherein the filter circuit comprises a notch filter including at least a first inductor in parallel with a first capacitor. 
     
     
         6 . The apparatus of  claim 1 , wherein the communication circuitry comprises a second matching circuit configured to match a third impedance of the communication circuitry to a fourth impedance of the antenna at the second frequency. 
     
     
         7 . The apparatus of  claim 6 , wherein the second matching circuit is further configured to substantially electrically isolate the communication circuitry from the antenna at the first frequency. 
     
     
         8 . The apparatus of  claim 1 , wherein the communication circuitry comprises near field communication circuitry. 
     
     
         9 . A method for wirelessly coupling an electronic device with other devices, comprising:
 electrically coupling, by a filter circuit, wireless power circuitry to an antenna at a first frequency and electrically isolating, by the filter circuit, the wireless power circuitry from communication circuitry coupled to the antenna at a second frequency different from the first frequency, the filter circuit coupled between the antenna and an input of the wireless power circuitry;   receiving wireless power by the wireless power circuitry from the antenna at the first frequency; and   receiving a signal by the communication circuitry from the antenna at the second frequency.   
     
     
         10 . The method of  claim 9 , wherein the filter circuit provides a substantially closed circuit at the first frequency and a substantially open circuit at the second frequency. 
     
     
         11 . The method of  claim 9 , further comprising:
 matching, by a first matching circuit connected to the antenna, a first impedance of the wireless power circuitry to a second impedance of the antenna at the first frequency;   wherein the filter circuit is configured to electrically isolate the wireless power circuitry from the first matching circuit, the antenna, and the communication circuitry at the second frequency.   
     
     
         12 . The method of  claim 11 , wherein the output of the antenna comprises a first terminal and a second terminal and wherein the first matching circuit comprises a first capacitor connected in series with the first terminal and a second capacitor connected in series with the second terminal. 
     
     
         13 . The method of  claim 9 , wherein the filter circuit comprises a notch filter including at least a first inductor in parallel with a first capacitor. 
     
     
         14 . The method of  claim 9 , wherein the communication circuitry comprises a second matching circuit, the method further comprising matching a third impedance of the communication circuitry to a fourth impedance of the antenna at the second frequency by the second matching circuit. 
     
     
         15 . The method of  claim 14 , further comprising electrically isolating the communication circuitry from the antenna at the first frequency by the second matching circuit. 
     
     
         16 . The method of  claim 9 , wherein the communication circuitry comprises near field communication circuitry. 
     
     
         17 . A method for manufacturing an electronic device for wirelessly coupling with other devices, comprising:
 providing an antenna;   providing wireless power circuitry configured to receive wireless power from the antenna at a first frequency;   connecting communication circuitry to the antenna, the communication circuitry configured to receive a signal from the antenna at a second frequency; and   connecting a filter circuit between the wireless power circuitry and the antenna, the filter circuit configured to electrically connect the wireless power circuitry to the antenna at the first frequency and electrically isolate the wireless power circuitry from the communication circuitry at the second frequency.   
     
     
         18 . The method of  claim 17 , wherein the filter circuit provides a substantially closed circuit at the first frequency and a substantially open circuit at the second frequency. 
     
     
         19 . The method of  claim 17 , further comprising:
 connecting a first matching circuit to the antenna, the first matching circuit configured to match a first impedance of the wireless power circuitry to a second impedance of the antenna at the first frequency;   wherein the filter circuit is configured to electrically isolate the wireless power circuitry from the first matching circuit, the antenna, and the communication circuitry at the second frequency.   
     
     
         20 . The method of  claim 19 , wherein the antenna comprises a first terminal and a second terminal and wherein the first matching circuit comprises a first capacitor connected in series with the first terminal and a second capacitor connected in series with the second terminal. 
     
     
         21 . The method of  claim 17 , wherein the filter circuit comprises a notch filter including at least a first inductor in parallel with a first capacitor. 
     
     
         22 . The method of  claim 17 , wherein the communication circuitry comprises a second matching circuit configured to match a third impedance of the communication circuitry to a fourth impedance of the antenna at the second frequency. 
     
     
         23 . The method of  claim 22 , wherein the second matching circuit is configured to electrically isolate the communication circuitry from the antenna at the first frequency. 
     
     
         24 . The method of  claim 17 , wherein the communication circuitry comprises near field communication circuitry. 
     
     
         25 . An apparatus for wirelessly coupling with other devices, comprising:
 means for generating a voltage under the influence of an alternating magnetic field;   means for receiving wireless power at a first frequency from the means for generating the voltage;   means for receiving a signal from the means for generating the voltage at a second frequency different from the first frequency; and   means for electrically connecting the means for receiving wireless power to the means for generating a voltage at the first frequency and electrically isolating the means for receiving wireless power from the means for receiving the signal at the second frequency, the means for electrically connecting connected between the means for generating a voltage and an input of the means for receiving wireless power.   
     
     
         26 . The apparatus of  claim 25 , wherein the means for electrically connecting provides a substantially closed circuit at the first frequency and a substantially open circuit at the second frequency. 
     
     
         27 . The apparatus of  claim 25 , further comprising:
 first means for matching a first impedance of the means for receiving wireless power to a second impedance of the means for generating the voltage at the first frequency;   wherein the means for electrically connecting is configured to electrically isolate the means for receiving wireless power from the first means for matching, the means for generating the voltage, and the means for receiving the signal at the second frequency.   
     
     
         28 . The apparatus of  claim 27 , wherein an output of the means for generating the voltage comprises a first terminal and a second terminal and wherein the first means for matching comprises a first capacitor connected in series with the first terminal and a second capacitor connected in series with the second terminal. 
     
     
         29 . The apparatus of  claim 25 , wherein the means for receiving the signal comprises a second means for matching configured to match a third impedance of the means for receiving the signal to a fourth impedance of the means for generating the voltage at the second frequency. 
     
     
         30 . The apparatus of  claim 29 , wherein the second means for matching is further configured to substantially electrically isolate the means for receiving the signal from the means for generating the voltage at the first frequency.